float  W2, H2, W3, H3, SPEED = 0.04;
float  PA = 2, PB = 2, PC = 10, PD = 10, PS = PI / 1000;

void setup()
{
  size(500, 500);
  frameRate(30);
  stroke(255, 192);
  noFill();
  smooth();
  
  W2 =  width / 2;
  H2 = height / 2;
  W3 =  width / 3;
  H3 = height / 3;
}

void mouseReleased()
{
  PA = random(2, 5);
  PB = random(2, 5);
  PC = random(2, 15);
  PD = random(2, 15);
  PS = random(1, 200) * (PI / 10000);
}

void draw()
{
  float  fr = radians(frameCount);
  
  background(0, 0, 31);

  beginShape();
  for (float i = 0.0; i < 2 * PI; i += PS)
  {
    float u = i + radians(frameCount * SPEED);
    float x = W3 * (sin(u) + sin(100 * u) / (PA + sin(fr / PC)) * sin(i + fr));
    float y = H3 * (cos(u) + cos(100 * u) / (PB + cos(fr / PD)) * cos(i - fr));

    curveVertex(W2 + x, H2 + y);
  };
  endShape();
}